Here's the deal with subs:
1. The Volume 1 subs, since it's from a Japanese DVD, will be full-movie English subs, no matter what. You won't be able to download an SRT, because the running times of the US (with forced subs - also note that they probably have two different subtitle tracks, one with just the "forced" subs, and one with all of them) and Japanese (without forced subs) versions will be different. You're pretty much gonna have to do the subs manually, yourself, using your US DVD as a reference (since, to my knowledge, there are no additional subtitled lines in the Japanese version).
2. Ripping subtitles from a DVD and applying them to the ripped version of the movie itself is going to be nasty business anyway, as DVD subs are designed to run at 29.97 fps, which means they won't sync well at 23.976 fps.
Also, do not edit at 29.97 fps. That will cause you no end of headaches. I don't know why Volume 2 keeps having these framerate issues - maybe that's why QtheGajin's edit has interlacing issues. But you're definitely gonna need to IVTC Volume 2 down to 23.976fps in order to work with it.
And since the US and Japanese DVDs both have the same issue, I guess you can use whichever one you want, depending on how you like that one scene to be edited.